Lightning-arrester.



S. C. BRYANT. LIGHTNING ARRESTER.

APPLICATION FILED JULY 21.1916.

1 ,260,750. Patented Mar. 26, 1918.

UNITED STATES STANLEY CHARLES BRYANT, OF CHICAGO, ILLINOIS.

LI GI-ITNIN G-ARRESTER.

Specification of Letters Patent.

Patented Mar. 26, 1918.

Application filed July 21, 1916. Serial No. 110,491.

To all whom it may concern:

Be it known that I, STANLEY CrIARLns BRYANT, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Lightning-Arrester, of which the following is a specification.

This invention relates to lightning arresters, and has for its primary object a construction and arrangement of parts in lightning arresters of the type having open or exposed air-gaps, whereby the line protected by the varrester will not be grounded in case the exposed air-gaps are bridged or filled with foreign particles.

ther objects and advantages will appear hereinafter as the description of the invention progresses and the novel features of the invention will be pointed out in the appended claims.

In describing the invention in detail reference is had to the accompanying drawing in which is illustrated the preferred physical embodiment of the invention in which like reference characters refer to like parts in the several views, and in which Figure 1 is a side elevation of a lightning arrester embodying the invention; Fig. 2 is a top plan View of the arrester; Fig. 3 is a vertical section through one of the line binding posts and shows certain parts carried by this post spread apart; Fig. 4 is a plan View of the perforated mica disk forming part of the structure embodying the invention; and Fig. 5 is a plan view of one of the spark plates detached, with the metallic washers and nuts removed.

Referring to the accompanying drawing, the lightning arrester illustrated as e1n bodying the invention comprises a base B of porcelain or other suitable insulating material which has a recess or cavity 5 therein opening out at the bottom. lVithin the recess 5 is supported a choke coil 6 of any suitable or well known construction, the terminals 7 and 8 of which are connected to binding posts 9 and 10, respectively, fastened to the base plate B. Secured to the base plate B between the binding posts 9 and 10 is a third binding post 11 which carries a ring 12 of carbon or similar material, which constitutes the grounded electrode of the arrester. The construction of the parts associated with the binding posts 9 and 10 is the same and a description of one will sunice for both. A spark plate 14: of brass or similar conducting material, having one end formed with teeth 16 disposed adjacent to the carbon ring 12, fits loosely over the binding post 9 or 10, the hole 15 in said spark plate being considerably larger than the corresponding binding post (see Figs. and 5) so as to leave a space between said post and said plate. Above the spark plate 1% is placed a ring 17 of mica or similar material (see Fig. 4:) which is provided with a number of small holes or perforations 18; and above the mica ring 17 is placed a metallic washer 19. A nut 20 fits over the binding post 9 or 10 and presses the washer 19 and the mica ring 17 against the upper face of the corresponding spark plate 141; and each binding post is provided with the usual washers 21 and nuts 22 for facilitating the attachment of wires thereto.

When the lightning arrester is installed, the line to be protected is connected to the binding posts 9 and 10, and the binding post 11 is connected to ground. The operation of the lightning arrester is like that of the common and well known open gap arrester and will be apparent to those skilled in the art without further explanation. The significant feature of this invention consists in providing a. number of inclosed and protected auxiliary air-gaps in series with the main air-gaps b y interposing the perforated mica ring 17 between the binding posts 9 and 10 and their corresponding spark plates 14. It is apparent that the holes 18 in the mica rings 17 are completely covered and cannot become filled with foreign substances, so that although the main air-gaps between the spark plates 14 and the carbon ring 12 may be bridged by particles of some conducting substance, nevertheless, the air-gaps afforded by these holes 18 prevent either side of the line from being grounded.

Obviously various changes may be made in the particular construction shown and ing inclosed air-gaps for insulating said described without departing from the inspark plate from said binding post.

vention and I do not wish to be restricted 2. A lightning arrester comprising a to the details of this construction as shown grounded electrode, a spark plate having an and described. edge disposed adjacent to said electrode 13 What I claim is: with an airgap between them, a binding 1. A lightning arrester comprising a post and means including a perforated memgrounded electrode, a spark plate disposed ber of insulating material separating said with an exposed air gap between it and said spark plate from said binding post.

a electrode, a binding post, and means form- STANLEY CHARLES BRYANT.

eapiea of this patent may be attained for five cents each, by addressing the Gnmmissioner' of 2mm,

Washington, I). C. 

